package gold.digger;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by fanzhenyu02 on 2020/6/27.
 * common problem solver template.
 */
public class LC640 {
    public long startExecuteTime = System.currentTimeMillis();


    public class Solution {
        public String coeff(String x) {
            if (x.length() > 1 && x.charAt(x.length() - 2) >= '0' && x.charAt(x.length() - 2) <= '9')
                return x.replace("x", "");
            return x.replace("x", "1");
        }

        public String solveEquation(String equation) {
            String[] lr = equation.split("=");
            int lhs = 0, rhs = 0;
            for (String x : breakIt(lr[0])) {
                if (x.indexOf("x") >= 0) {
                    lhs += Integer.parseInt(coeff(x));
                } else
                    rhs -= Integer.parseInt(x);
            }
            for (String x : breakIt(lr[1])) {
                if (x.indexOf("x") >= 0)
                    lhs -= Integer.parseInt(coeff(x));
                else
                    rhs += Integer.parseInt(x);
            }
            if (lhs == 0) {
                if (rhs == 0)
                    return "Infinite solutions";
                else
                    return "No solution";
            }
            return "x=" + rhs / lhs;
        }

        public List<String> breakIt(String s) {
            List<String> res = new ArrayList<>();
            String r = "";
            for (int i = 0; i < s.length(); i++) {
                if (s.charAt(i) == '+' || s.charAt(i) == '-') {
                    if (r.length() > 0)
                        res.add(r);
                    r = "" + s.charAt(i);
                } else
                    r += s.charAt(i);
            }
            res.add(r);
            return res;
        }
    }

    public void run() {
        Solution solution = new Solution();
        List<Integer> list = new ArrayList<>();
        System.out.println(solution.toString());
    }

    public static void main(String[] args) throws Exception {
        LC640 an = new LC640();
        an.run();

        System.out.println("\ncurrent solution total execute time: " + (System.currentTimeMillis() - an.startExecuteTime) + " ms.");
    }
}
